Xen devel - Oct 2005 - [PATCH] fix for NMI causing auto reboot with SMP domains

This patches fix a NMI problem I was seeing when running xenoprof on
SMP guests.
  The machine used to auto reboot if an NMI was received in a critical
time window when
  context switching domains. There is a small time window when the GDT
may become unmapped
  (after CR3 is updated and before setting GDTR with the new GDT during
a domain context
  switch. If an NMI is received during this time window a triple fault
is triggered causing
  the machine to auto reboot. This patch fix this problem. Please,
apply.

  I should be sending patches for the new version of xenoprof that
supports SMP domains
  profiling , shortly.

  Thanks

  Signed-off-by: Jose Renato Santos <jsantos@hpl.hp.com>


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On 19 Oct 2005, at 18:42, Santos, Jose Renato G wrote:
>   This patches fix a NMI problem I was seeing when running xenoprof on
> SMP guests.
>   The machine used to auto reboot if an NMI was received in a critical
> time window when
>   context switching domains. There is a small time window when the GDT
> may become unmapped
>   (after CR3 is updated and before setting GDTR with the new GDT during
> a domain context
>   switch. If an NMI is received during this time window a triple fault
> is triggered causing
>   the machine to auto reboot. This patch fix this problem. Please,
> apply.
Good catch. That''s an evil bug...

  -- Keir


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